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Research Article

Perovskite bridging PbS quantum dot/polymer interface enables efficient solar cells

Xing Meng1,§, Yifan Chen1,§, Fan Yang1, Jieqi Zhang3, Guozheng Shi1, Yannan Zhang1, Haodong Tang4, Wei Chen4, Yang Liu1, Lin Yuan1, Shaojuan Li2, Kai Wang4, Qi Chen3, Zeke Liu1,2( ), Wanli Ma1( )
Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou 215123, China
State Key Laboratory of Applied Optics, Changchun Institute of Optics Fine Mechanics and Physics, Changchun 130033, China
i-Lab, CAS Center for Excellence in Nanoscience, Suzhou Institute of Nano-Tech and Nano-Bionics, Suzhou 215123, China
Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, China

§ Xing Meng and Yifan Chen contributed equally to this work.

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Graphical Abstract

An interfacial layer of CsPbI3 quantum dots (QDs) was inserted between the active layer and organic polymer hole-transporting layer for PbS QD solar cells. The relative soft perovskite can mediate the interface and form favorable energy level alignment, improving charge extraction and reducing interfacial charge recombination.

Abstract

Conjugated polymers have been explored as promising hole-transporting layer (HTL) in lead sulfide (PbS) quantum dot (QD) solar cells. The fine regulation of the inorganic/organic interface is pivotal to realize high device performance. In this work, we propose using CsPbI3 QDs as the interfacial layer between PbS QD active layer and organic polymer HTL. The relative soft perovskite can mediate the interface and form favorable energy level alignment, improving charge extraction and reducing interfacial charge recombination. As a result, the photovoltaic performance can be efficiently improved from 10.50% to 12.32%. This work may provide new guidelines to the device structural design of QD optoelectronics by integrating different solution-processed semiconductors.

Keywords

lead sulfide quantum dotsolar cellsperovskiteenergy level alignment

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Nano Research
Volume 15 Issue 7,
July 2022
Pages 6121-6127
DOI: 10.1007/s12274-022-4195-8
Cite this article:
Meng X, Chen Y, Yang F, et al. Perovskite bridging PbS quantum dot/polymer interface enables efficient solar cells. Nano Research, 2022, 15(7): 6121-6127. https://doi.org/10.1007/s12274-022-4195-8
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Received: 19 December 2021
Revised: 17 January 2022
Accepted: 24 January 2022
Published: 19 March 2022
© Tsinghua University Press 2022
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